630 Transactions. 
Host: Thelymitra longifolia Forst. f. On leaves and sheaths. Herb. 
No. 319. I, II, III. Upper Hutt (Wellington), Miss J. M. Anson! 27th 
Nov., 1921. II, ПІ. York Bay (Wellington), E. Н. Atkinson! 13th Feb., 
1921 
Distribution: Australia. 
The host is indigenous and widespread ; it occurs also in Australia and 
Tasmania (Cheeseman, 1906, p. 670). The aecidia, hitherto unrecorded, 
are abundant on the specimens forwarded by Miss Anson; they are 
remarkable for their minute size, and for the irregular manner in which they 
are scattered over the leaf. This rust differs from U. Microtidis in the 
larger and more coarsely knobbed teleutospores. 
9. Uromyces Polygoni Fuckel. (Fig. 10.) Polygonaceae (3). 
Fel., Symb. Myc., p. 64, 1869. 
Puccinia Polygoni Pers., Neues. Mag. Bot., vol. 1, р. 119, 1794. Р. Polygonii- 
Aviculare Pers., Syn. Fung., р. 227, 1801. Р. Aviculare DC., Fl. Fr., vol. 2, 
p. 221, 1805. Dicaeoma Aviculare S. F. Gray, Nat. Arr. Brit. PL, vol. 1, 
p. 542, 1821. Uromyces Aviculare Schroet., Abh. Schles. Ges., vol. 68, p. 8, 
1870. Puccinia vaginaliwm Link. : Cke., in Handbk., р. 495, 1871. Aecidium 
Aviculare Kuntze: Cke., l.c., p. 545. Caeomurus Polygoni Kuntze, Rev. 
Pedes 3, p. 450, 1898. Nigredo Polygoni (Pers.) Arth., Res. Sci. Congr. 
den Я 1906. 
: , SUTTO 
broadly elliptical, obovate, or subglobose, 25-30 x 18-92 mmm. ; epispore 
ely and densely verruculose, 1:5-2 mmm thick, golden-brown, with 4 
equatorial germ-pores on one face. 
III. Teleutosori amphigenous, more frequently caulicolous, on leaves 
scattered, on stems forming lines up to 10 mm. lon , compact, pulvinate, 
chocolate-brown, soon naked. Spores elliptical, frequently obovate, some- 
times pyriform, 25-40 x 16-25mmm.; apex rounded, often bluntly 
acuminate, sometimes truncate, thickened up to 8mmm., darker in colour, 
base attenuate ; epispore smooth, 2-2-5 mmm. thick, cinnamon-brown, 
cell-contents granular; pedicel persistent, hyaline, or frequently tinted, 
up to 120 x 12 mmm. ; germ-pore apical, conspicuous. 
Host: Polygonum aviculare L. On leaves and stems. Herb. Nos. 8, 317. 
I, П, HI. Lincoln (Canterbury) T. Kirk! 16th Nov., 1881. II, Ш. Tau- 
ranga (Auckland), б. Н. С. 13th Jan., 1920. II, III. Alexandra (Otago), 
A, H. Cockayne! 10th Feb., 1921. 
Distribution : Australia ; North America ; Europe ; Africa ; Asia. 
Arthur (1917, p. 296) has by cultural experiments shown that the teleuto- 
spores of Puccinia subnitens Diet., when sown on Polygonum aviculare, 
produce spermogones and aecidia on that host, and claims in consequence 
that the aecidia “hitherto erroneously associated with U. Polygon” are 
of P. subnitens and not of U. Polygoni. In America this may be so, but 
in New Zealand all three stages have been collected at the same time on 
the same host plant; and, moreover, as P. subnitens has not been col- 
lected in New Zealand, it would appear that Arthur’s supposition is not 
applicable here. 
